（一般查询）为什么n ++执行速度比n + 1快 [英] (General Query) why n++ executes faster than n+1

问题描述

为什么n ++的执行速度比n + 1还要快......还是realli执行得更快？


谢谢

Venugopal.B

Hi,
why n++ executes faster than n+1..... or does it realli execute faster?

thanks
Venugopal.B

推荐答案

VenuGopal< Ve ******* @ discussion.microsoft.com>写道：

VenuGopal <Ve*******@discussions.microsoft.com> wrote:

为什么n ++执行速度比n + 1还要快......还是realli执行得更快？

why n++ executes faster than n+1..... or does it realli execute faster?

我想你的意思是问：


|如果n是int，那么

| n ++;

|执行速度比

|快n = n + 1;

| ？


上面的答案是：不。两个语句都编译成确切的

相同的IL指令。

I assume that you mean to ask:

| If n is an int, does
| n++;
| execute faster than
| n = n + 1;
| ?

The answer to the above is: no. Both statements compile down to the exact
same IL instructions.

n ++只是更快地输入...

- -

David Anton
www.tangiblesoftwaresolutions.com

主页：

清除VB：清理过时的VB.NET代码

即时C＃：从VB.NET转换为C＃

即时VB：从C＃转换为VB.NET

即时J＃：从VB.NET转换为J＃

" VenuGopal"写道：

n++ just types faster...
--
David Anton
www.tangiblesoftwaresolutions.com
Home of:
Clear VB: Cleans up outdated VB.NET code
Instant C#: Converts from VB.NET to C#
Instant VB: Converts from C# to VB.NET
Instant J#: Converts from VB.NET to J#
"VenuGopal" wrote:

为什么n ++执行速度比n + 1还要快.....还是realli执行得更快？

感谢< Venugopal.B

Hi,
why n++ executes faster than n+1..... or does it realli execute faster?

thanks
Venugopal.B

我听过面试问题，为什么++ n的执行速度比n ++更快？
？ br />
前缀运算符总是比后缀更快。后缀

版本涉及对前缀的复制和内部调用。对于简单的

类型，两者之间的相对成本应该很小。对于更多

复杂对象（例如迭代向量），成本可能会大于b
。 C ++文献中的普遍共识（更多例外C ++，更多有效的C ++）是前缀版本应始终是优先的b / b
。这样做你不会出错。另外，写++

而不是++不需要任何费用。

I have heard interview questions about why would ++n executes faster
than n++?
The prefix operator will always be faster than the postfix. The postfix
version involves a copy and internal call to the prefix. For simple
types the relative cost between the two should be small. For more
complicated objects (e.g. iterating over a vector) the cost may be
larger. The general consensus in C++ literature (More Exceptional C++,
More Effective C++) is that the prefix version should always be
preferred. Doing this you cannot go wrong. In addition, writing ++
instead of ++ costs nothing.

这篇关于（一般查询）为什么n ++执行速度比n + 1快的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！